Microsoft Windows DNS Server WPAD Access Validation Vulnerability

Risk

Medium

Date Discovered

March 10, 2009

Description

The Microsoft Windows DNS Server is prone to an access-validation vulnerability because the software fails to properly restrict access when defining WPAD (Web Proxy Autodiscovery Protocol) entries.
An authenticated attacker may exploit this issue to create a WPAD DNS entry. This may aid in man-in-the-middle and spoofing attacks. Other attacks are also possible.

Technologies Affected

Avaya Messaging Application Server

Avaya Messaging Application Server MM 1.1

Avaya Messaging Application Server MM 2.0

Avaya Messaging Application Server MM 3.0

Avaya Messaging Application Server MM 3.1

Microsoft Windows 2000 Server

Microsoft Windows 2000 Server SP1

Microsoft Windows 2000 Server SP2

Microsoft Windows 2000 Server SP3

Microsoft Windows 2000 Server SP4

Microsoft Windows Server 2003 Datacenter Edition

Microsoft Windows Server 2003 Datacenter Edition Itanium SP1

Microsoft Windows Server 2003 Datacenter Edition SP1

Microsoft Windows Server 2003 Datacenter x64 Edition

Microsoft Windows Server 2003 Datacenter x64 Edition SP2

Microsoft Windows Server 2003 Enterprise Edition

Microsoft Windows Server 2003 Enterprise Edition Itanium SP1

Microsoft Windows Server 2003 Enterprise Edition SP1

Microsoft Windows Server 2003 Enterprise x64 Edition

Microsoft Windows Server 2003 Enterprise x64 Edition SP2

Microsoft Windows Server 2003 Itanium

Microsoft Windows Server 2003 Itanium SP1

Microsoft Windows Server 2003 Itanium SP2

Microsoft Windows Server 2003 Standard Edition

Microsoft Windows Server 2003 Standard Edition SP1

Microsoft Windows Server 2003 Standard Edition SP2

Microsoft Windows Server 2003 Standard x64 Edition

Microsoft Windows Server 2003 Terminal Services

Microsoft Windows Server 2003 Web Edition

Microsoft Windows Server 2003 Web Edition SP1

Microsoft Windows Server 2003 Web Edition SP2

Microsoft Windows Server 2003 x64 SP1

Microsoft Windows Server 2003 x64 SP2

Recommendations

Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

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